
LT3519/LT3519-1/LT3519-2
TYPICAL PERFORMANCE CHARACTERISTICS (T A = 25°C unless otherwise noted)
FB Regulation Voltage
vs Temperature
FB OPENLED Threshold
vs Temperature
SHDN /UVLO Threshold
vs Temperature
1.25
V IN = 12V
100
90
V IN = 12V
1.30
V IN = 12V
1.24
1.23
80
70
60
50
1.28
1.26
SHDN /UVLO RISING
1.22
1.21
40
30
20
1.24
1.22
SHDN /UVLO FALLING
10
1.20
–50
–25
0
25
50
75
100
125
0
–50
–25
0
25
50
75
100
125
1.20
–50
–25
0
25
50
75
100
125
TEMPERATURE (°C)
Switch Saturation Voltage
(V CESAT )
3519 G10
TEMPERATURE (°C)
Schottky Leakage Current
vs Temperature
3519 G11
TEMPERATURE (°C)
3519 G12
Schottky Forward Voltage Drop
500
450
400
350
300
250
200
150
100
50
10
9
8
7
6
5
4
3
2
1
V R = 24V
900
800
700
600
500
400
300
200
100
0
0
200
400
600
800
1000
0
–50
–25
0
25
50
75
100
125
0
0
200
400
600
800
1000
SWITCH CURRENT (mA)
3519 G13
TEMPERATURE (°C)
3519 G14
SCHOTTKY FORWARD VOLTAGE DROP (mV)
3519 G15
1.2
1.1
Oscillator Frequency
vs Temperature (LT3519-1)
2.5
2.4
Oscillator Frequency
vs Temperature (LT3519-2)
2.3
1.0
2.2
0.9
2.1
0.8
2.0
0.7
–50
–25
0
25
50
75
100
125
1.9
–50
–25
0
25
50
75
100
125
TEMPERATURE (°C)
3519 G16
TEMPERATURE (°C)
3519 G17
3519fa
5